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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenue, before fuel surcharges $ 155,342 $ 182,592
Freight Transportation Service [Member]    
Revenue, before fuel surcharges $ 136,701 $ 160,969
Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]    
Operating Revenues, percentage 100.00% 100.00%
Truckload Services [Member] | Freight Transportation Service [Member]    
Revenue, before fuel surcharges $ 92,429 $ 102,200
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]    
Operating Revenues, percentage 67.60% 63.50%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]    
Revenue, before fuel surcharges $ 44,272 $ 58,769
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]    
Operating Revenues, percentage 32.40% 36.50%